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4.5.1— System Ready LED
The "System Ready LED" is lit if the Gxxx or Hxxx panel
is in Auto, there are no transfer errors (excluding comm's
error or fail to synch), and the Maintenance Disconnect
Switch is in AUTO. If the comm's are bad then the system
ready light will flash but the system will still function with
local control. Under all circumstances, if the Generator is
not in the AUTO position, the switch controller will locally
close the switch to Utility power if it is available.
4.5.2— Standby Operating LED
This LED will light when the Generator is running. This is
determined by the Generator frequency being between
20 and 80 Hz. This LED will flash along with the Utility
Available LED to indicate a "fail to sync" condition.
4.5.3— Switch Position LEDs
The transfer switch position is monitored by two auxiliary
contacts mounted on the transfer switch mechanism.
These LEDs display the position of the main contacts.
If there is a transfer switch error (fail to close or open) the
appropriate LED will flash. In the case of an OTTS
switch, both LEDs will flash.
4.5.4— Utility Available LED
This LED indicates that Utility voltage is present but does
not indicate that it is within the tolerances set by the H
panel (as this is determined in the H panel). It does indi-
cate that Utility voltage is within 70-130% of nominal.
This led will flash along with the standby operating led to
indicate a "fail to sync" condition.
4.5.5— Test Switch and Curtailment Input
The Test switch will only operate if the communications
link is active, also the generator must be stopped, i.e.,
not in minimum run or cooldown.
Pressing the switch will cause the generator controller to
command a transfer to standby using all the pre-pro-
grammed timers and settings. The unit will transfer back
to utility after the switch is pressed again and the "return
to utility" timer expires. Pressing the "return to normal"
switch will force this timer to expire and the unit to return
to the utility position. The switch can also be "mimicked"
via a digital input on (J1-17) for curtailment. The pin
needs to be cycled to start the test and also cycled to
stop the test.
4.5.6— Fast Test Button
The Fast Test button will only operate if the communica-
tions link is active. Pressing the button will cause the
Generator controller to command a transfer to standby
Automatic Transfer Switch Owner's Manual
using all the standard settings but with reduced time
delays. Specifically the following timers are reduced to 1
second:
•
Line Interrupt Delay timer
•
Engine Warmup timer
•
Engine Minimum Run timer
•
Engine Cooldown timer
•
Return to Utility timer
NOT affected are:
•
Signal Before Transfer timer
•
Time Delay Neutral timer
The unit will initiate a transfer back to Utility after 5 sec-
onds of the transfer mechanism in the Standby position.
4.5.7— Return to Normal Switch
This switch will abort the Return to Utility timer and cause
the system to return to Utility operation (assuming the
Utility source is good). It will not operate if the Communi-
cations link is bad.
4.5.8— Maintenance Disconnect Switch (Auto/
Manual)
In the Manual position, the transfer switch is physically
isolated from the signals that tell it to operate, the transfer
mechanism will not change state in the Manual position.
This position should be used when manually operating
the transfer switch mechanism. In the Auto position, the
transfer switch is operated by the switch controller. For
automatic operation the switch should be left in the Auto
position.
4.6 — Sequence of Operation
When acceptable Utility source voltage is available, the
Maintenance Disconnect switch is in AUTO and the com-
munication link to the generator is good, observe the fol-
lowing:
•
Utility Available LED, on front of door, is ON.
•
Utility Switch Position LED, on front of door, is ON.
•
System Ready LED, on front of door, is ON.
4.6.1— Sequence 1 - Utility Voltage Dropout
•
Utility Voltage goes outside of the value set in the
generator control panel (range is 5-25 Vrms of
nominal voltage, factory default setting is +/- 25
Vrms). If the communication link is not good the
ATS controller will take control and the range is 70
to 130% of the nominal voltage selected with a 5
Operation
17
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